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(No Model) Q D. A. MOGORMIGK.

I ELECTRICAL ANNUNOIATOR. No. 284,878. Patented Sept. 11, 1883.

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DAVID A.. MCCORMICK, OF DETROIT, MICHIGAN, ASSIGNOR OF ONE-HALF TO LEWVIS MANN, OF SAME PLACE.

ELECTRICAL ANNUNCIATOR.

SPECIFICATION forming part of Letters Patent No. 284,878, dated September 11,1883,

Application filed May 22, 1883. (No model.)

[0 all whom, it may concern Be it known that I, DAVID A. MoCoRMroK, of Detroit, in the county of Wayne and State of Michigan, have invented a new and useful Iniprovement in Electrical Annun ciators, ofWhich the following is a specification.

.Figure 1 is an isometrical perspective, and Fig. 2 is an elevation.

My invention consists in an improved mode of construction, hereinafter pointed out.

A represents a portion of the front plate of an electrical annunciator, made of diamagnetic material.

13 represents an electro-magnet, Whose core C C projects beyond thehelix at both ends, and one end of which, C, is fastened to plate A.

G represents a piece of diamagnetic substance, (brass) fastened to core C by screw H.

D E represent Wires connected to the electro-mag'net.

I represents an iron rock-shaft, journaled in brass piece G and plate A a little to one side of a vertical plane passing through the center of core C C, passing through plate A, and carrying on its outer end a pointer.

J J represent two iron armatures, secured to rock-shaft I, and so placed that when shaft I is rocked the ends of armatures J J will pass close to the extended core C C, but without touching it.

K represents a stop fixed in plate A, against which one armature J 'will strike and rest. Said armatures are placed in a position nearly vertical, as shown in Fig. l.

L represents a brass plate, secured to plate A by screws N N in oblique slots M M, and serves both to limit the motion of armatures J and to raise them to the position shown in Fig. 1. Well-known device. XVhen the armatures J are in the position shown in Fig. 1, if the electromagnet is excited by passing an electric current through wires D E, core C C attracts the armatures, they approach the core until 5 they pass a vertical position, and then fall or swing until checked by plate L, as shown at J, Fig. 2, thus partially rotating rock-shaft I and moving the pointer.

What I claim as my invention, and desire to secure by Letters Patent, is

1. In an electrical annunciator, an electromagnet whose core is extended beyond both ends of the helix, in combination with an iron rock-shaft journaled outside the vertical plane passing through the axis of the core, and carrying a pointer, and having thereon two armatures so placed that each end of the core ofthe electro-niagnet will attract one of said armatures, substantially as shown and described.

2. The combination of the electro-magnet B, having core C C, plate A, brass piece G, rock-shaft I, armatures J J, and stop K, sub stantially as shown and described.

DAVID A. MCCORMICK.

Witnesses CYRUs E. LOTHROP, GEO. H. \LOTHROP.

It is operated by crank P, and is a 0 

